[ACCEPTED]-Alerts when navigating away from a web page-alerts
Accepted answer
By the browser. It's the beforeunload event handler 7 that returns the customized text of the 6 dialog, which is only the middle of the 5 three paragraphs - the other two paragraphs 4 as well as the text of the buttons cannot 3 be customized or otherwise changed.
window.onbeforeunload = function(){ return 'Testing...' }
// OR
var unloadListener = function(){ return 'Testing...' };
window.addEventListener('beforeunload', unloadListener);
Will 2 yield a dialog that says
Are you sure you want to navigate away from this page?
Testing...
Press OK to continue, or Cancel to stay on the current page.
You can nullify 1 this by setting the handler to null
window.onbeforeunload = null;
// OR
window.removeEventListener('beforeunload', unloadListener);
Source:
stackoverflow.com
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